Xp Home to Xp Professional Step Upgrade (why wont it work?)

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I bought a Toshiba a75-s209 with XP Home. The processor however is a pentium 4
3.06 with
 Hyperthreading. XP Home doesn't support hyperthreading. Yet when I try to
upgrade with Windows XP, it says my current version of windows is newer and thus
it wont install.

Is there anyway to upgrade to xp professional with the same installation I have
(programs, settings)?

If not, will the same toshiba software work with xp professional?
(Will the laptop work properly with a fresh install of xp professional?)

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